psi

[sahy, psahy]

noun, plural psis.

the 23rd letter of the Greek alphabet (Ψ, ψ).

the group of consonant sounds represented by this letter.

Origin of psi

1350–1400; Middle English < Greek pseî

psi

[sahy]

noun

any purportedly psychic phenomenon, as psychokinesis, telepathy, clairvoyance, or the like.

Compare pseudoscience, parapsychology.

Origin of psi

1940–45; shortening of psychic or parapsychic

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for psis

Historical Examples of psis

"You'd sure look silly if all the Psis in town blackballed you," I snarled at him.
Modus Vivendi
Gordon Randall Garrett
"Nobody forced her to associate with a gang of Psis," he said.
Modus Vivendi
Gordon Randall Garrett
Crescas appeared as if by magic—Psis act like that—and had me by the arm.
Modus Vivendi
Gordon Randall Garrett
His black eyes had that lively watchfulness you associate with Psis.
Modus Vivendi
Gordon Randall Garrett
Their attire, their homes, everything about Psis, seems tasteful.
Modus Vivendi
Gordon Randall Garrett

British Dictionary definitions for psis

PSIS

abbreviation for (in New Zealand)

Public Service Investment Society, New Zealand's largest credit union

psi

abbreviation for

pounds per square inch

psi

noun

the 23rd letter of the Greek alphabet (Ψ, ψ), a composite consonant, transliterated as ps

paranormal or psychic phenomena collectively
(as modifier)psi powers

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for psis

psi

23rd letter of the Greek alphabet. Use for "psychic force, paranormal phenomenon" dates from 1942 (probably from psychic (adj.)).

psis in Medicine

psi

[sī, psī]

n.

The 23rd letter of the Greek alphabet.